How to Price AI Voice Agent Services for Your Clients
Most agencies price AI voice agent services as a one-time setup fee plus a monthly retainer with included call minutes and an overage rate. Start from your real costs, the voice platform’s per-minute usage and your white-label platform fee, then price on the value of the calls the agent handles, not the minutes.
What does an AI voice agent cost the agency to run?
An agency’s cost to run an AI voice agent is roughly $0.10 per call minute on Retell AI for a typical receptionist, plus a flat white-label platform fee shared across all clients. You need both numbers before setting a price:
- Usage cost per client. On Retell AI that is roughly $0.07 to $0.31 per minute depending on the voice and AI model, plus $2 per month per phone number. A typical receptionist setup lands around $0.10 per minute. See our Retell AI pricing breakdown.
- Platform cost, shared across clients. Call Supplai is $197 per month for the white-label platform, however many clients you run on it.
Add your own time: building the agent, testing it, and monthly tuning.
What are the common pricing models for AI voice agent services?
| Pricing model | How it works | Best for |
|---|---|---|
| Setup fee + monthly retainer | One-time build fee, then a fixed monthly fee with included minutes | Most small business clients |
| Retainer + overage | Monthly fee covers a minute block; extra minutes billed per minute | Clients with growing or seasonal call volume |
| Per-minute resale | Bill usage at a marked-up per-minute rate | High-volume, cost-conscious clients |
| Outcome-based | Charge per booked appointment, qualified lead or resolved call | Sales and booking agents with measurable outcomes |
Many agencies combine them: a setup fee, a retainer with included minutes, and an overage rate.
How should agencies set the setup fee?
An AI voice agent setup fee should cover the hours it takes to design, connect and test the agent for that client, priced by complexity. The work typically includes:
- Writing and testing the conversation flow
- Connecting the calendar, CRM or practice-management system
- Loading the knowledge base: hours, services, policies
- Test calls and revisions before go-live
Price it by complexity. A receptionist that answers FAQs and books into one calendar is a smaller build than a sales agent with CRM logging and qualification logic.
How do you calculate margin on an AI voice agent?
Margin on an AI voice agent is what the client pays minus your voice platform usage and your share of the white-label platform fee. Here is an illustrative example for one client; the prices show the math and are not recommended rates.
| Monthly | |
|---|---|
| Client pays: retainer including 1,000 minutes | $500 |
| Your Retell AI usage (1,000 min at about $0.095 + $2 number) | −$97 |
| Your share of Call Supplai ($197 across 5 clients) | −$39 |
| Gross margin for this client | $364 (73%) |
The margin grows with each client you add, because the Call Supplai platform fee stays flat at $197 per month while your client count rises.
Should you price AI voice agents by the minute or by value?
Price AI voice agents on value wherever you can, and keep per-minute pricing for overages. A client does not care what a minute costs; they care what the agent replaces or earns:
- Front desk: compare against part of a receptionist’s time, or after-hours calls that currently go to voicemail.
- Sales: compare against leads that go cold without a fast callback.
- Support: compare against hours spent on repetitive calls.
Per-minute pricing invites clients to compare you with the raw platform rate. A retainer tied to outcomes keeps the conversation on results.
How do you protect margin as call volume grows?
- Include a minute cap in every retainer and state the overage rate in the contract.
- Review usage monthly so a spike doesn’t surprise you or the client.
- Right-size the AI model, because it is the biggest variable in per-minute cost.
- Reprice annually as the client’s volume and results become clear.
How do agencies get started selling AI voice agents?
Start with one niche you understand, price your first two or three clients with setup plus retainer, and track results you can show the next prospect. Our guide on how to start an AI voice agency walks through the steps.
Want to model pricing for your first clients? Book a Call Supplai demo.
Frequently asked questions
How much should an agency charge for an AI receptionist?
There is no standard rate. Start from your costs, roughly $0.10 per minute on Retell AI for a typical receptionist plus your platform fee, then set a setup fee and monthly retainer based on the value of the calls the agent handles for that client.
Should AI voice agencies charge a setup fee?
Most do. A setup fee covers designing the conversation, connecting calendars or CRMs, loading the knowledge base and testing before go-live, and it signals that the agent is built for that client.
How do agencies handle clients who use more minutes than planned?
Put a minute cap in every retainer and an overage rate in the contract, review usage monthly, and reprice annually as the client's call volume becomes clear.